MATHEMATICAL MODEL DEPENDENCIES BAUD RATE FROM THE LENGTH OF THE SPECIALIZED DIGITAL NETWORK CANOPEN

Abstract

At modern enterprises, the main increase in production occurs due to the increase in labor productivity by automating the processes of managing technological processes. Modern automation systems for the control of technological processes are, as a rule, created on the basis of microprocessor elements and specialized digital networks. Many modern process automation systems for controlling technological processes are based on a specialized CANopen digital network. The maximum length of a CANopen network segment can be 5000 m. The data transfer rate decreases as the segment length increases. However, until now there was no mathematical model of the change in data transmission speed depending on the length of the network segment. Therefore, the developers of the network and the organizations that support it experimentally determined the value of data transmission speed on network segments with a length of: 25, 50, 100, 250, 500, 1000, 2500, 5000 m. This fact complicated the process of analyzing computer systems at the stage their design. During the design of computer systems for control and management of industrial facilities that require a guaranteed reaction to random events in a set period of time, developers, as a rule, in cases where the length of the segment is in the intermediate sections between the specified points, perform calculations on the value of the speed for longer segment length than is real. Considering that there may be tens of thousands of nodes on complex objects, the sum results in a significant deviation from real performance indicators in the direction of increasing costs for unnecessary increase in system performance due to the impossibility of using in calculations the real values ​​of the data transmission speed for the real length of the segment between a node that transmits data and that receives data. A mathematical model of the dependence of the data transfer rate on the length of the CANopen network segment has been developed. Such a mathematical model should ensure the determination of the data transfer rate at any point of the segment of the specialized CANopen digital network. This will contribute to the improvement of the quality of design and will allow to create computer control and management systems that will meet the requirements of the consumer without excessive overspending